Initial commit: Home automation docs and CODESYS project

- Reorganized project: codesys/, docs/codesys|redesign|integration|reference/, scripts/
- CODESYS project and exports in codesys/
- Documentation index in docs/README.md
- Redesign and light naming configuration
- Water boiler control and safety design

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/redesign/redesign-summary.md

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+# Redesign Summary - Quick Reference
+
+## What We're Changing
+
+### Current Structure → New Structure
+
+**Before**:
+- Room-based with generic `l_1`, `l_2` names
+- Fixed 6 lights per room
+- Toggle-based control
+- No status feedback from relays
+
+**After**:
+- Room-based in CODESYS, flat in Home Assistant
+- Descriptive names: `kitchen_main`, `master_bedroom_bedside_left`
+- Command-based control (ON/OFF for HA, toggle for Zigbee)
+- Actual relay status feedback
+- Water boiler with comprehensive safety
+
+---
+
+## Key Documents
+
+1. **`light-naming-configuration.md`** ⭐ **START HERE**
+   - Complete light naming for all 16 rooms
+   - Water boiler control structure
+   - Safety measures
+   - **Action**: Review and modify with your actual lights
+
+2. **`redesign-implementation-roadmap.md`**
+   - Step-by-step implementation guide
+   - Phase-by-phase checklist
+   - Timeline estimates
+
+3. **`structure-redesign-analysis.md`**
+   - Detailed analysis of structure options
+   - Why Option 4 (Hybrid) was chosen
+
+4. **`fb_switch-redesign-recommendation.md`**
+   - Function block redesign details
+   - Control logic improvements
+
+---
+
+## Quick Structure Reference
+
+### Light Naming Convention
+```
+Format: {room}_{function}
+
+Examples:
+- kitchen_main
+- master_bedroom_bedside_left
+- outdoor_front_security
+```
+
+### Function Types
+- `main` - Primary light
+- `bedside_left/right` - Bedside lamps
+- `under_cabinet` - Task lighting
+- `security` - Security lighting
+- `ambient` - Atmospheric lighting
+- etc.
+
+### CODESYS Access
+```iec
+rooms.kitchen.main.ha_on := TRUE;
+rooms.master_bedroom.bedside_left.state;
+```
+
+### Home Assistant Entity
+```
+light.kitchen_main
+light.master_bedroom_bedside_left
+```
+
+---
+
+## Water Boiler Safety Features
+
+1. ✅ **Temperature Protection** (max 80°C, min 10°C)
+2. ✅ **Time Limits** (max 8h ON, min 30m OFF)
+3. ✅ **Flow Detection** (shut off if no flow)
+4. ✅ **Emergency Stop** (immediate shutdown)
+5. ✅ **Pressure Protection** (if sensor available)
+6. ✅ **State Monitoring** (relay status readback)
+7. ✅ **Error Reporting** (comprehensive error codes)
+
+---
+
+## Next Steps
+
+1. **Review** `light-naming-configuration.md`
+2. **Modify** light names per room based on actual installation
+3. **Map** relays to lights
+4. **Start** Phase 1 of implementation roadmap
+
+---
+
+**Status**: Ready for configuration review  
+**Priority**: Review and customize light names first